M&S sell Percy Pigs in a 170g bag for £1.65, while the rival sweets come in a 200g bag and cost just £1.

Poundland's fruity offering is also gelatine free, so suitable for vegetarians - although M&S also stock Veggie Percys, to ensure no-one misses out.

(Image: Poundland)

This isn't the first time that Poundland have made their own version of a popular high street treat.

Its famous Twin Peaks bars - strikingly similar to Toblerone - proved a huge hit with shoppers when they hit the shelves last year, with a fruit and nut version and a white chocolate option later being introduced.